Kinematics of crustal deformation along the central Himalaya

Sharma, Yogendra; Pasari, Sumanta; Ching, Kuo-En; Verma, Himanshu; Choudhary, Neha

doi:10.1007/s11600-023-01175-5

Artykuł - szczegóły

Tytuł artykułu

Kinematics of crustal deformation along the central Himalaya

Autorzy

Sharma Yogendra , Pasari Sumanta , Ching Kuo-En , Verma Himanshu , Choudhary Neha

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-023-01175-5

Warianty tytułu

Języki publikacji

Abstrakty

Utilizing an updated dataset of 145 GNSS surface velocities, this study examines the fault slip rate and fault geometry along the Main Himalayan Thrust (MHT) in the central Himalaya. Employing a Bayesian inversion model, the present analysis reveals that the upper portion of the MHT ramp exhibits full locking, while the lower flat displays creeping motion. The estimated locking depth and fault depth of MFT range from 4.3 ± 2.6 km to 9.7 ± 2.2 km and 13.5 ± 3.1 km to 15.8 ± 1.9 km, respectively, along the central Himalaya. Further, the slip rate along the transition zone lies in the range of 1.4 ± 0.8 mm/yr to 2.7 ± 0.5 mm/yr. Considering the amount of uncertainties as ~1-2 mm/yr in GNSS velocities, the study suggests that the transition zone along the middle flat of the MHT also exhibits locking behavior. Thus, the estimated locking depth extends to ~15.0 km down-dip and covers a horizontal distance of ~90 km (locking line) on the surface, reaching the foothills of the Higher Himalaya. Furthermore, along the deeper flat of the MHT, the slip rate ranges from 19.4 ± 2.5 mm/yr in the west to 12.8 ± 1.6 mm/yr in the east along Nepal Himalaya. The analysis also calculates the slip deficit rate along the MHT fault plane, revealing values of ~15.1 mm/yr in western Nepal, ~12.7 mm/yr in central Nepal, and ~10.6 mm/yr in eastern Nepal. These slip deficit rates across different segments of central Nepal indicate the potential for large earthquakes in the region. The results are further supported by a resolution test using a checkerboard synthetic model, demonstrating the capability of the GNSS network to capture the slip rate along the MHT. These findings inevitably contribute to a comprehensive assessment of the seismic hazard potential in the central Himalayan region.

Słowa kluczowe

Central Himalaya Bayesian inversion model slip rate fault geometry GPS velocity

Himalaje centralne model inwersji bayesowskiej współczynnik poślizgu geometria uskoku

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2024

Tom

Vol. 72, no. 2

Strony

553--564

Opis fizyczny

Bibliogr. 58 poz.

Twórcy

autor

Sharma Yogendra

National Cheng Kung University, Tainan, Taiwan

autor

Pasari Sumanta

86.sumanta@gmail.com

Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, India

https://orcid.org/0000-0001-8498-8746

autor

Ching Kuo-En

National Cheng Kung University, Tainan, Taiwan

autor

Verma Himanshu

Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, India

autor

Choudhary Neha

Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, India
Department of Geography, National Taiwan University, Taipei, Taiwan

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Typ dokumentu

Bibliografia

Identyfikator YADDA

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